feat: streaming sha256 CAR hash

[alanshaw]

In leu of multiformats/js-multiformats#261 landing, this PR uses the nodejs crypto library to create a streaming sha256 hasher.

Before:

$ ipfs-car hash snow.car 
node:internal/fs/promises:516
    throw new ERR_FS_FILE_TOO_LARGE(size);
          ^

RangeError [ERR_FS_FILE_TOO_LARGE]: File size (11998084756) is greater than 2 GiB
    at readFileHandle (node:internal/fs/promises:516:11)
    at async Module.hash (file:///usr/local/lib/node_modules/ipfs-car/cmd/hash.js:13:13) {
  code: 'ERR_FS_FILE_TOO_LARGE'
}

Node.js v20.11.0

After:

$ ipfs-car hash snow.car
bagbaierabdsb7q55nozng74qw267etolakl4jwrszyjb5elw43zercwmowva

(Note: snow.car is an 11GB CAR)

resolves #158

[olizilla]

OH NICE YES PLZ